Drum sander



INVEN TOR. 2 27-74 A .fio/v/raws r/ flrroe/vm e DRUM SANDER Teofil L. Bonkowski, Los Angeles, Calif.

Application November 22, 1954, Serial No. 470,185

4 Claims. (Cl. 51-194) My invention relates to a drum sander, and included in the objects of my invention are:

First, to provide a drum sander wherein a large roll of sanding tape is stored within the sander drum and the end of the tape wrapped about the drum is so arranged that the sanding tape may be withdrawn as needed to replace the used end thereof.

Second, to provide a magazine type sander drum so arranged that the removal of the sanding surface may be accomplished with the removal of the sander drum from its drive means on which it may be mounted and wherein such renewal of the sanding surface may be accomplished with a minimum amount of delay.

With the above and other objects in view as may appear hereinafter, reference is directed to the accompanying drawings in which:

Figure 1 is an end view of my sander drum.

Figure 2 is a transverse sectional view thereof through 2-2 of Figure 1.

Figure 3 is an end view of the sander drum shown in its open position.

Figure 4 is a similar view showing the opposite end of the sander drum.

Figure 5 is a fragmentary sectional view taken through 5-5 of Figure 2.

Figure 6 is a fragmentary elevational view taken in the plane 6-6 of Figure 3 with the sanding tape omitted.

Figure 7 is a fragmentary elevational view taken along the plane 7-7 of Figure 3, also with the tape removed.

My sanding drum comprises a pair of half shell members 1 and 2 which are complementary. That is, each member constitutes one half of a hollow cylinder closed at its axial extremities. The two half shell members 1 and 2 thus confront along a diametrical plane, and at one extremity thereof, are joined by a hinge 3. One of the shell members is provided with an axially directed mounting stem 4 concentric with the cylindrical surface of the shell members. The shell members are provided with overlapping rings 6 and 7 which, when the shell members are closed, form an aperture coaxial with the mounting stem.

Fitted within the shell members 1 and 2 is a hub or mandrel 8, having a journal boss 9 extending into a bore or socket formed in the mounting stem 4. The opposite end of the hub or mandrel 8 journals in the ring 6. Slidably mounted within the hub 8 is a latch pin 10 which protrudes through the ring 7 and is yieldably held in an extended position by a spring 11. The extremity of the latch pin 10 is provided with a slot 12, and the side surface of the protruding portion of the latch pin is provided with grip grooving or knurling 13. A stop pin 14 rises in a slot provided in the hub 8 and limits outward movement of the latch pin.

The extremity of the hub 8 terminates between the rings 6 and 7, and is provided with a series of latch notches 15 engaged by a ratchet spring 16. The ratchet spring may be in the form of a leaf spring fastened to an end of the shell member 1.

States atent The cylindrical periphery of the shell members 1 and 2 is covered by a pad 17 formed of rubber or similar material. The pad extends across the hinge 3 but is split at the confronting extremities of the shell members diametrically opposite of the hinge 3. The hub 8 is provided with a clamping clip 18 which secures the end of a roll of sand tape 19 wrapped about the hub 8. The extremity of the sanding tape passes outwardly between the shell members 1 and is wrapped about the pad 17.

The extreme end of the sanding tape overhangs the confronting end of the shell members 1 and is secured by retaining dogs 20 which project from this confronting surface. It will be observed that these confronting surfaces of the shell members 1 and 2 are thickened radially and that the confronting portion of the shell member 1 is provided with recesses 21 which receive the dogs 20.

The stem 4 is mounted or connected to a suitable rotatable shaft. The shell members may be opened by pressing inwardly on the latch pin 10 until the ring 7 is cleared. A roll of sanding tape is wrapped on the hub 8 by inserting one end under the grip 1S and then rotating the hub 8, this being accomplished by inserting a screwdriver or a similar object in the slot 12 to assist in rotating or by manually engaging the end of the pin. After the sanding tape has been wound in place, the end thereof is wrapped around shell 1 then around shell 2 and its extremity forced over the dogs 20. To tighten the sanding tape, the hub 8 is rotated and retained in position by the latch spring 16. When this is done, the shell members are closed by pressing inwardly on the latch pin, pressing the shell members closed until the latch pin registers with the hole in the ring 7. It will be seen that the sanding tape is thus tightly held between the confronting surfaces of the shell member opposite from the hinge 3. When the end of the sanding tape has worn, it is merely necessary to open the shell members, draw out an additional length of the tape and refasten.

Having fully described my invention, it is to be understood that I do not wish to be limited to the details herein set forth, but my invention is of the full scope of the appended claims.

I claim:

1. A drum sander, comprising: a pair of half shells together defining a hollow cylindrical drum split diametrically, a hinge joining said shells at one diametrical extremity; a drive shaft secured to an end of one of said half shells located concentrically with respect to said cylindrical drum; the opposite ends of said half shells having overlapping loop portions adapted, when said half shells are closed, to align with said drive shaft; a rotatable mandrel coaxial with said shaft and loop portions adapted to receive a roll of sanding tape, an end of which may wrap about said drum; a latch pin slidable in said mandrel to enter said loop portions to retain said half shells in closed position.

2. A drum sander, comprising: a pair of half shells together defining a hollow cylindrical drum split diametrically; a hinge joining said half shells at one diametrical extremity; a drive shaft secured to an end of one of said half shell-s located concentrically with respect to said cylindrical drum; the opposite ends of said half shells having overlapping loop portions adapted, when said half shells are closed, to align with said drive shaft; a mandrel journaled between said shaft and loop portions and adapted to receive a roll of sanding tape, an end of which is adapted to be wrapped about said cylindrical drum;

clamp means for said tape, incorporating the portions of said half shells diametrically opposite from said hinge; and a latch pin axially movable in said mandrel to enter said loop portions and secure said half shells together.

3. A drum sander, comprising: a pair of half shells together defining a hollow cylindrical drum split diametrically; a hinge joining said shells at one diametrical extremity; a drive shaft secured to an end of one of said half shells located concentrically with respect to said cylindrical drum; the opposite ends of said half shells having overlapping loop po-rtions adapted, when said half shells are closed, to align with said drive shaft; a rotatable mandrel coaxial with said shaft and loop portions adapted to re ceive a roll of sanding tape, an end of which may Wrap about said drum; a latch pin slidable in said mandrel to enter said loop portions to retain said half shells in closed position; said latch pin adapted to protrude from said half shells to form a handle for rotating said mandrel; and a yieldable ratchet means tending to restrain said mandrel against rotation.

4. A drum sander, comprising: a pair of'half shells together defining a hollow cylindrical drum split diametrically; a hinge joining said half shells at one diametrical extremity; a drive shaft secured to an end of one of said half shells located concentrically with respect to said cylindrical drum; the opposite ends of said half shells having overlapping loop portions adapted, when said half, shells are closed, to align with said drive shaft; a mandrel journaled between said shaft and loop portions References Cited in the file of this patent UNITED STATES PATENTS 232,333 Buzzell Sept. 21, 1880 481,938 Everett et al. Sept. 6, 1892 733,577 Catt July 14, 1903 856,601 Prevost June 11, 1907 1,070,284 Olmstead et al. Aug. 12, 1913 1,889,040 Solem Nov. 29, 1932 2,100,780 Huhn Nov. 30, 1937 2,296,615 Illmer et al. Sept. 22, 1942 2,366,158 Steenbock et a1 Jan. 2, 1945 

